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Energies
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Urban Electromobility and Electric Propulsion
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Urban Electromobility and Electric Propulsion

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F3: Power Electronics".

Deadline for manuscript submissions: closed (10 March 2024) | Viewed by 1767

Special Issue Editors

Dr. Sung-An Kim

E-Mail Website
Guest Editor
High Power Electric Propulsion Center, Korea Maine Equipment Research Institute, Ulsan 44776, Republic of Korea
Interests: aircraft, automobiles and ship electric propulsion system; computational fluid damics analysis; electric machines; electric drives and power eletronics; electromanetic analysis
Prof. Dr. Yun-hyun Cho

E-Mail Website
Guest Editor
Department of Electrical Engineering, Dong-A University, Busan, Republic of Korea
Interests: design and analysis of electric machines

Special Issue Information

Dear Colleagues,

The climate crisis has been faced due to environmental pollution caused by continuous industrial growth. Accordingly, environmental regulations are being strengthened worldwide, and the industry is focusing on electrification. Electric propulsion is essential as urban mobility, including automobiles, aircraft, and ships, requires conversion from fossil fuels to eco-friendly fuels. The basic components of electric propulsion are motors, generators, inverters and converters, and batteries, and design, analysis, and control technologies are required for system application. Therefore, this Special Issue aims to present and disseminate new solutions related to the theory, design, modeling, application, control, and monitoring of all types of urban electromobility and electric propulsion.

Topics of interest for publication include, but are not limited to:

  • electric propulsion systems for aircraft, automobiles, and ships
  • special electric machines and drive systems
  • remotely operated electric vehicles
  • unmanned aerial electric vehicles
  • hybrid electric propulsion systems
  • hybrid battery control systems
  • electric propulsion control algorithms
  • optimal design methodologies
  • condition monitoring and predictive maintenance techniques

Dr. Sung-An Kim
Prof. Dr. Yun-hyun Cho
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • battery systems
  • converters
  • electric machines
  • electric propulsion
  • inverters
  • power electronics
  • urban electromobility

Published Papers (2 papers)

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Research

15 pages, 9605 KiB  
Article
Design of 200 kW Cryogenic Induction Motor for Liquefied Natural Gas Emergency Pump
by Kyung-Pyo Hong and Ju Lee
Energies 2024, 17(8), 1898; https://doi.org/10.3390/en17081898 - 16 Apr 2024
Viewed by 369
Abstract
This paper presents a design study focusing on the thermal safety of an induction motor integrated with a pump unit, which operates submerged in liquefied natural gas (LNG) in the LNG tanks of LNG carrier ships ranging from 150 K to 200 K [...] Read more.
This paper presents a design study focusing on the thermal safety of an induction motor integrated with a pump unit, which operates submerged in liquefied natural gas (LNG) in the LNG tanks of LNG carrier ships ranging from 150 K to 200 K cubic meters (CBM). In this study, we carried out the electromagnetic design of the induction motor and verified the thermal safety against a temperature increase due to losses during the motor operation through thermal fluid analysis, taking into account the discharge flow of the emergency pump and the air gap of the motor. In the electromagnetic design, the resistivity of the stator winding copper conductors and the rotor aluminum bars, which act as important design constants for the rated operating and starting characteristics of the induction motor in cryogenic temperature environments, reflects the characteristic of linearly changing with the temperature. In cryogenic environments, the reduction in the resistance of the rotor bars of the induction motor leads to a decrease in the starting torque characteristics. Therefore, the shape optimization design of the rotor bar was performed to improve the starting torque characteristics, and 2D electromagnetic analysis was performed on the magnetic flux density distribution and magnetic saturation using Ansys Electromagnetics 16.0. After the electromagnetic design, a 3D thermal flow analysis was conducted using Ansys Fluent 17.0, considering the stator iron losses, rotor bar losses, stator and rotor iron losses, and stray load losses as heat sources. The flow analysis aimed to analytically verify the thermal safety concerning the vaporization of the LNG flowing through the emergency pump’s discharge flow path and the motor’s internal air gap. The motor was manufactured, and the rated and starting operating characteristics of the motor were measured under LN2 submerged conditions according to the IEEE 112 F1 method, to validate whether the performance characteristics met the specifications’ requirements. Subsequently, the thermal safety of the motor was finally verified through a temperature increase test under LNG submerged conditions after assembling it with the emergency pump. Full article
(This article belongs to the Special Issue Urban Electromobility and Electric Propulsion)
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16 pages, 8055 KiB  
Article
Design and Experimental Verification of Hubless Rim-Driven Propulsor Consisting of Bearingless Propeller for an Unmanned Underwater Drone
by Myoung-Su Kim and Sung-An Kim
Energies 2023, 16(21), 7458; https://doi.org/10.3390/en16217458 - 6 Nov 2023
Viewed by 963
Abstract
This paper presents the design and experimental verification of a hubless rim-driven propulsor (HRDP) for an unmanned underwater drone. The bearings of the HRDP are required to rotate and fix the propeller. However, the bearing increases the weight and size of the propulsor. [...] Read more.
This paper presents the design and experimental verification of a hubless rim-driven propulsor (HRDP) for an unmanned underwater drone. The bearings of the HRDP are required to rotate and fix the propeller. However, the bearing increases the weight and size of the propulsor. Therefore, this paper proposes a structure in which the rotor of a surface-mounted permanent magnet synchronous motor (SPMSM) and a hubless propeller are combined without the bearings in the rim-driven propulsor. The design procedure of the propulsor is established and the response surface method (RSM) is used to design and optimize the proposed structure. The validity of the HRDP with the proposed structure is verified through simulation results using an electromagnetic field (EF) analysis and computational fluid analysis, and test results using a water tank. Finally, compared to the initial HRDP, the weight of the SPMSM in the optimized HRDP is decreased by 7.3%, and by reducing the required torque by about 19%, power consumption is reduced by about 24.66 W. Full article
(This article belongs to the Special Issue Urban Electromobility and Electric Propulsion)
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